How do i make home screen like in jelly bean.. Id like to place my main home screen in the middle.
I don't think you can disable the default Launcher if you're unrooted. But if it's still listed as open, it isn't necessarily taking up any battery or CPU, if it's not actively doing anything. In addition, the Nexus 5 has so much available system RAM that I doubt having the default Launcher open in the background (while Nova is running) would have any impact on performance at all.